Astragal boot



FIG. 1 is a perspective view of an astragal boot, the broken line showing of a hole, a semi-cylindrical cut-out, and two fingers being environmental only and forming no part of the claimed design;

FIG. 2 is a bottom view of the astragal boot of FIG. 1;

FIG. 3 is a top view of the astragal boot of FIG. 1;

FIG. 4 is a front view of the astragal boot of FIG. 1;

FIG. 5 is a rear view of the astragal boot of FIG. 1;

FIG. 6 is a left side view of the astragal boot of FIG. 1; and,

FIG. 7 is a right side view of the astragal boot of FIG. 1. 

The ornamental design for an astragal boot, as shown and described. 